Texas Instruments TPS3823-25DBVTG4

Overview

TPS3823-25DBVTG4 from Texas Instruments is a fixed-threshold voltage supervisor IC with integrated watchdog timer and manual reset input, designed for reliable power-on reset and supply monitoring in microcontroller-based systems. It features a 2.25 V nominal threshold (V_IT−), 200 ms reset delay (t_d), 1.6 s watchdog timeout (t_tout), 15 µA typical supply current, and operates across −40°C to 85°C in a 5-pin SOT-23 package - used in embedded control and portable electronics where deterministic reset timing and fault detection are critical.

For engineers reviewing the TPS3823-25DBVTG4 datasheet, TPS3823-25DBVTG4 pinout, TPS3823-25DBVTG4 application, or TPS3823-25DBVTG4 equivalent, key selection criteria include its active-low push-pull RESET output, fixed 2.25 V supervision level, MR-triggered reset assertion, WDI-driven watchdog timeout behavior, and compatibility with 2.5 V supply rails in space-constrained designs.

Technical Context

The TPS3823-25DBVTG4 implements a precision bandgap reference and comparator-based supervision architecture with internal hysteresis (50 mV) to reject supply noise. Its watchdog timer requires periodic falling-edge transitions on WDI to prevent reset assertion, with timeout set to 1.6 s (typical) - distinct from the 200 ms reset delay that governs power-up and brownout recovery timing.

It uses a fixed internal voltage divider to set V_IT− = 2.25 V (±2.5% over temperature), eliminating external resistor networks. The MR input includes an internal 90 kΩ pullup and supports logic-level triggering without external components, while RESET output drives up to 3 mA sink current with VOL ≤ 0.4 V at I_OL = 1 mA.

Key Specifications

Pinout & Package

TPS3823-25DBVTG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with TPS3823-25DBVTG4, TPS3823-25DBVR offers identical performance in volume production formats, while MAX6326–25 trades internal pullup and push-pull drive for open-drain configurability - making TPS3823-25DBVTG4 optimal for compact, low-power, single-supply 2.5 V systems needing minimal external components.

Availability

TPS3823-25DBVTG4 is available at Aetrix Electronics and suitable for microcontroller power sequencing, industrial sensor node supervision, and portable medical device boot integrity requiring stable component supply, guaranteed traceability, and long-term lifecycle support.

Supply support for TPS3823-25DBVTG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and real-time control technologies.

The TPS382x product line was developed specifically for robust, low-power supply supervision in DSP, microcontroller, and microprocessor systems - emphasizing deterministic reset timing, integrated watchdog functionality, and minimal external component count.

FAQ

What is the exact reset threshold voltage for TPS3823-25DBVTG4?

The TPS3823-25DBVTG4 has a nominal negative-going input threshold voltage (V_IT−) of 2.25 V, with a tolerance of ±2.5% over the full operating temperature range (−40°C to 85°C). This value is factory-trimmed and fixed by an internal voltage divider, requiring no external calibration. The hysteresis is 50 mV, resulting in a total window of 2.20 V to 2.30 V for reliable noise rejection during supply transients.

Does TPS3823-25DBVTG4 support active-high reset output?

No, TPS3823-25DBVTG4 provides only an active-low push-pull RESET output (Pin 1). Active-high reset (RESET) is available only on TPS3824 and TPS3825 variants. The TPS3823-25DBVTG4 does not include the second output terminal or internal logic for active-high signaling - its RESET pin asserts low during fault conditions and releases high after the 200 ms delay when VDD remains above V_IT− + V_HYS.

How does the watchdog timer in TPS3823-25DBVTG4 operate?

The watchdog timer in TPS3823-25DBVTG4 times out after 1.6 s (nominal) if no falling edge is detected on the WDI pin (Pin 4). Each falling edge resets the timer; a sustained high or low state beyond the timeout triggers RESET assertion for 200 ms. If WDI is left floating, the device internally toggles the pin to prevent false timeout - but a 1 kΩ pulldown is recommended if deterministic behavior is required.

Can TPS3823-25DBVTG4 be used with a 3.3 V supply rail?

Yes, TPS3823-25DBVTG4 operates with VDD from 1.1 V to 5.5 V and can monitor any supply within that range, but its internal threshold is fixed at 2.25 V - making it appropriate for supervising a 2.5 V rail, not 3.3 V. For 3.3 V supervision, use TPS3823-33 variants (e.g., TPS3823-33DBVTG4), which have a 2.93 V threshold. Using TPS3823-25DBVTG4 on 3.3 V would result in permanent RESET deassertion.

What is the purpose of the MR pin on TPS3823-25DBVTG4?

The MR (Manual Reset) pin (Pin 3) on TPS3823-25DBVTG4 is an active-low input that forces immediate RESET assertion regardless of VDD level or watchdog state. It includes an internal 90 kΩ pullup resistor, so it can be driven directly by an open-drain GPIO, mechanical switch, or logic gate. When pulled low, RESET remains active for the full 200 ms delay even after MR returns high, ensuring consistent reset pulse width.